The incident in a lift at the Standard Hotel in New York was reportedly ignited after Solange learned of Jay's plan to attend the party alone.

A source told the New York Daily News that the singer asked Jay why he couldn't just go home with Beyonce - and asked her "why does your husband need to go to the club right now?"

The source claimed Jay replied to Solange: "you are one to talk."

In the incredible footage, the rapper and his wife stepped into an elevator with her singer sibling before she snapped and started to kick out, unleashing a violent attack which was captured by surveillance cameras.

The video obtained by gossip website TMZ, shows a man - seemingly a bodyguard - stepping in and holding Solange back after she assaulted her sister's husband .